1. Remove PyDev and reinstall it;

2. See if the code can run normally. If so, go to the settings of the PyDev plug-in and restore the settings to the default values.

3. Delete eclipse directly, reinstall eclipse and configure a new PyDev.

Python is an object-oriented explanatory computer programming language, which was invented by Dutch Guido van Rossum in 1989, and was first published in 199 1 year.

Due to the simplicity, readability and expansibility of Python language, more and more research institutions abroad use Python for scientific computing, and some well-known universities also use Python to teach programming courses. For example, Carnegie Mellon University's programming foundation, MIT's computer science and introduction to programming are all taught in Python.

Many open source scientific computing software packages provide Python calling interfaces, such as the famous computer vision library OpenCV, 3D visualization library VTK and medical image processing library ITK. There are even scientific computing extensions specifically for Python, such as the following three classic scientific computing extensions: NumPy, SciPy and matplotlib, which provide Python with fast array processing, numerical operation and drawing functions respectively.

Therefore, the development environment composed of Python language and its many extended libraries is very suitable for engineers and researchers to process experimental data, make charts and even develop scientific computing applications.